Table 2, 239°240py and “4!am Contents and Ratios for Soils Used in Soybean Experiment Soil source 2395240py (nci/g) 2*lam (nCi/g) 239,240py/24 1am Mean + §.E.* Mean + S.E.* Ratio + S.E.** Area 11 B 2.8 + 0.41 0.44 + 0.068 6.5 + 0.17 Area 11C 9.6 + 1.3 1.8 + 0.20 5.3 + 0.17 Area 11 D 4.6 t+ 0.24 0.87 + 0.062 5.2 + 0.12 Area 13 6.0 + 0.93 1.1 + Q.11 5.6 + 0.27 Clean Slate 1 4.3 + 0.57 0.23 + 0.033 19 + 0.33 Clean Slate 2 15 + 3.6 0.72 + Q.13 21 + 1.9 Clean Slate 3 11 + 1.6 0.59 + 0.073 19 + 0.67 + 0.79 0.28 + 0.033 21 + 0.88 Double Track 5.9 *Standard error of mean - [var./n] 1/2 rst. = [ool gu 2 ey 2 - xi? / (n-1) UK, la 57 (Snedecor and Cochran, 1967)